在元旦文艺汇演上，小明弹奏电吉他时他不断用手指去控制琴弦长度，这样做得目的是为了改变声音的______；琴声是通过______传播到我们耳中的。
音调；空气
When he broke his leg, we took him to _______ hospital at once. [ ]
A. the
B. a
C. one
D. /
体细胞配合
